odd problem that shows erroneous data in folder properties

Need some help to understand a confusing situation. The issue is that when I click on ‘properties’ of duplicate folders on different drives, the size/file count isn’t the same…

The situation is that I am creating a backup architecture, using 2 hard drives, and 2 USB drives. The goal is to back up 1 very large (1.27 TB) folder, using file copy (not encrypted, compressed, just a file for file copy). The folder in question is named “0-Swenson Data”.

The working 0-Swenson Data folder is on the D Drive “Data”
The backup folder is on the E Drive “Backup”, in the folder “D Drive Data Backup”
The E drive is duplicated on 2 USB drives, “Toshiba Silver USB” and Toshiba Black USB”

I have verified that all 4 folders are exactly the same using the WinMerge utility, which compares each individual file at the byte level.

The screenshots below show the issue. The really odd thing is that if I move the folder 0-Swenson Data to the top level on the backup drives (not 1 level down in the folder “D Drive Data Backup”), the properties will match the source on the D Drive. The last screen shot shows that.

thanks for the follow up ken... the folders/files are exactly the same, the problem is with the data reported when you check the folder's properties. if the folder isn't at the very top of the drive, it shows bad data.

per your request...

windows 10, version 1809, build 17763.253

tree size reports the folders the same, 1.3TB, 78143 files, 4279 folders

Quite interesting ! Do you think any of your full path names when they are in the sub level on the backup drives ( ie 1 level down in the folder eg “D Drive Data Backup” )" exceed 256 characters ?

i really doubt they get to 256 characters, but can't guarantee it... any clue as to how i could quickly check?